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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 804 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.75² =
  2. 2.96² =
  3. 3.56² =
  4. 4.35² =
  5. 5.74² =
  6. 6.51² =
  7. 7.46² =
  8. 8.32² =
  9. 9.89² =
  10. 10.36² =
  11. 11.97² =
  12. 12.99² =
  13. 13.78² =
  14. 14.93² =
  15. 15.77² =
  16. 16.92² =
  17. 17.47² =
  18. 18.91² =
  19. 19.85² =
  20. 20.37² =
  21. 21.88² =
  22. 22.95² =
  23. 23.94² =
  24. 24.38² =
  25. 25.64² =
  26. 26.73² =
  27. 27.62² =
  28. 28.79² =
  29. 29.61² =
  30. 30.68² =
  31. 31.57² =
  32. 32.55² =
  33. 33.69² =
  34. 34.84² =
  35. 35.54² =
  36. 36.45² =
  37. 37.48² =
  38. 38.33² =
  39. 39.41² =
  40. 40.43² =

Answer key

  1. 5625
  2. 9216
  3. 3136
  4. 1225
  5. 5476
  6. 2601
  7. 2116
  8. 1024
  9. 7921
  10. 1296
  11. 9409
  12. 9801
  13. 6084
  14. 8649
  15. 5929
  16. 8464
  17. 2209
  18. 8281
  19. 7225
  20. 1369
  21. 7744
  22. 9025
  23. 8836
  24. 1444
  25. 4096
  26. 5329
  27. 3844
  28. 6241
  29. 3721
  30. 4624
  31. 3249
  32. 3025
  33. 4761
  34. 7056
  35. 2916
  36. 2025
  37. 2304
  38. 1089
  39. 1681
  40. 1849

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